Kartik Agaram
move
command that moves columns (analogous to browser tabs) to the left, while continually truncating columns on the right beyond some limit. The combination of these two has changed how I work, from messes all over the surface to much more localized access patterns where I live near the top left and move things over to it as I need them. (It's not a catastrophe if I lose a tab because on-disk search is working well.)